<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <input type="text" id="ipt">
  <script>
    const ipt = document.querySelector('#ipt')
    ipt.addEventListener('keyup', (e) => {
      // console.log(e);
      /* alert */
      // console.log(e.keyCode, 11111);
      if (e.keyCode == 13) {
        console.log('按下的是enter');
      }
    })
  </script>
</body>

</html>